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Elaboration de complexes porphyrines/C60 : Vers la synthèse de modèles des antennes collectrices d'énergie lumineuse et du centre réactionnel du système photosynthétique.

Abstract : To modelize the antenna effect and to obtain a charge-separated system, the two first steps of photosynthesis, we have associated porphyrins and fullerenes. Porphyrins have structural and photophysical properties similar than those of the chlorophyll.
To obtain an antenna-effect, we have realized several assemblies of porphyrins, with always a free-base porphyrin. Then, we have seen an energy-transfer from metallated porphyrins to the free-base porphyrin.
To obtain a charge-separated system, we have synthetised complexes between multiporphyrinic assemblies, with a free-base porphyrin bearing a crown-ether moity and a C60-derivative.
It was possible to observe high stability constants in those complexes, coming from association of H-bonds and π− π interactions between the porphyrin-core and the C60 surface, having then a molecular cup-and-ball.
These complexes very stable in solution afford us to obtain strong quenching of the porphyrin light-emission by the C60, either by electron-transfer or by energy-transfer.
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Mathieu Walther. Elaboration de complexes porphyrines/C60 : Vers la synthèse de modèles des antennes collectrices d'énergie lumineuse et du centre réactionnel du système photosynthétique.. Autre. Université Paul Sabatier - Toulouse III, 2006. Français. ⟨tel-00259075⟩

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